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Related Party Relationships and Transactions - Summary of Related Party Transactions (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of transactions between related parties [line items]      
Dividend ₨ 609 ₨ 311 ₨ 66
Buyback of shares 110,000 [1] 25,000  
Rent Paid 6,236 5,953 5,184
Entities controlled by directors [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods and services 136 114 240
Assets purchased 290 106 231
Dividend 3,171 5,087 20,559
Buyback of shares 63,745 19,638  
Rental Income 42 43 36
Rent Paid 7 8 22
Others 31 93 43
Balance as at the year end      
Receivables 39 76 137
Payables 57 22 225
Key management personnel [member]      
Disclosure of transactions between related parties [line items]      
Dividend 191 287 1,147
Buyback of shares   2  
Rent Paid 6 6 6
Remuneration and short-term benefits 248 231 273
Other benefits 130 156 135
Balance as at the year end      
Payables ₨ 55 ₨ 27 ₨ 37
[1] Refer Note 18.